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A tubular structural member, such as a horizontal box beam or vertical column, includes a set of elongated flange members of reinforced pultruded plastics material, and each flange member has longitudinally extending U-shaped opposite edge portions defining slots. Generally flat composite web member

A tubular structural member, such as a horizontal box beam or vertical column, includes a set of elongated flange members of reinforced pultruded plastics material, and each flange member has longitudinally extending U-shaped opposite edge portions defining slots. Generally flat composite web members have opposite edge portions projecting into the slots, and epoxy adhesive rigidly secures the interfitting edge portions to form a tubular box-beam or multi-sided column. The web members may have curved or tapered opposite edge portions to form a beam with camber or a tapered column having a polygonal cross-sectional configuration. Reinforcing plates or ribs may be adhesively bonded to the flange and/or web members according to the structural loading on the member.

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[ I claim:] [1.] A tubular structural member comprising at least two elongated one-piece flange members of fiber reinforced pultruded plastics material, each of said flange members having a channel-shaped cross-sectional configuration formed by a substantially flat base wall of substantially uniform

[ I claim:] [1.] A tubular structural member comprising at least two elongated one-piece flange members of fiber reinforced pultruded plastics material, each of said flange members having a channel-shaped cross-sectional configuration formed by a substantially flat base wall of substantially uniform thickness and with said base wall integrally connecting two spaced double wall channel portions projecting from only one side of said base wall, each of said channel portions having two parallel spaced walls defining therebetween a longitudinally extending slot, at least two generally flat elongated composite web members each having fiber reinforcement and a uniform thickness substantially the same as the width of said slots, each of said web members having longitudinally extending opposite edge portions projecting into opposing said slots within two of said channel portions, and an adhesive resin within said slots and bonding said edge portions of said web members to said parallel spaced walls of said channel portions to form a rigid tubular structural member.